From her interview in Serbian daily newspaper "Sportski žurnal" after the match against Radwanska:

I don't think I played that badly, even though she won with a convincing scoreline. I'm simply not match tough, I've had a lot of problems with my shoulder and wrist during the last three years. I feel lucky I even got to play here.
I'm not optimistic. There have been so many injuries and they're dificult to heal. I have a chronic lesion of my shoulder tendon and it's not sure that even surgery can fix it. As a result, I can't practice more than 2 hours a day. It doesn't jeopardize my career, but it means I can't give my best as I can't train with full intensity. There's a lot of scar tissue in the muscle and I can't overuse it. I've tried everything.
I talked to Janko Tipsarević about the stem cell treatment he underwent and I tried it as well, with a different method. I don't want to go through it again as it's harmful for the entire organism. Janko, Rafa and I have done a lot of damage to our bodies. No matter how mentally tough I am, my body just can't go on anymore.